// The voltage that a reading of 1 from `analogRead` actually represents
JsVarFloat jshReadVRef() {
#ifdef NRF52
nrf_saadc_channel_config_t config;
config.acq_time = NRF_SAADC_ACQTIME_3US;
config.gain = NRF_SAADC_GAIN1_6; // 1/6 of input volts
config.mode = NRF_SAADC_MODE_SINGLE_ENDED;
config.pin_p = NRF_SAADC_INPUT_VDD;
config.pin_n = NRF_SAADC_INPUT_VDD;
config.reference = NRF_SAADC_REFERENCE_INTERNAL; // 0.6v reference.
config.resistor_p = NRF_SAADC_RESISTOR_DISABLED;
config.resistor_n = NRF_SAADC_RESISTOR_DISABLED;
// make reading
nrf_saadc_enable();
nrf_saadc_resolution_set(NRF_SAADC_RESOLUTION_14BIT);
nrf_saadc_channel_init(0, &config);
return 6.0 * (nrf_analog_read() * 0.6 / 8192.0);
#else
const nrf_adc_config_t nrf_adc_config = {
NRF_ADC_CONFIG_RES_10BIT,
NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE,
NRF_ADC_CONFIG_REF_VBG }; // internal reference
nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config);
return 1.2 / nrf_adc_convert_single(ADC_CONFIG_PSEL_AnalogInput0);
#endif
}
// The voltage that a reading of 1 from `analogRead` actually represents
JsVarFloat jshReadVRef() {
const nrf_adc_config_t nrf_adc_config = {
NRF_ADC_CONFIG_RES_10BIT,
NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE,
NRF_ADC_CONFIG_REF_VBG }; // internal reference
nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config);
return 1.2 / nrf_adc_convert_single(ADC_CONFIG_PSEL_AnalogInput0);
}
/// Returns a quickly-read analog value in the range 0-65535
int jshPinAnalogFast(Pin pin) {
if (pinInfo[pin].analog == JSH_ANALOG_NONE) return 0;
const nrf_adc_config_t nrf_adc_config = {
NRF_ADC_CONFIG_RES_8BIT, // 8 bit for speed (hopefully!)
NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE,
NRF_ADC_CONFIG_REF_VBG }; // internal reference
nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config);
// sanity checks for nrf_adc_convert_single...
assert(ADC_CONFIG_PSEL_AnalogInput0 == 1);
assert(ADC_CONFIG_PSEL_AnalogInput1 == 2);
assert(ADC_CONFIG_PSEL_AnalogInput2 == 4);
// make reading
return nrf_adc_convert_single(1 << (pinInfo[pin].analog & JSH_MASK_ANALOG_CH)) << 8;
}
// Returns an analog value between 0 and 1
JsVarFloat jshPinAnalog(Pin pin) {
if (pinInfo[pin].analog == JSH_ANALOG_NONE) return NAN;
const nrf_adc_config_t nrf_adc_config = {
NRF_ADC_CONFIG_RES_10BIT,
NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE,
NRF_ADC_CONFIG_REF_VBG }; // internal reference
nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config);
// sanity checks for nrf_adc_convert_single...
assert(ADC_CONFIG_PSEL_AnalogInput0 == 1);
assert(ADC_CONFIG_PSEL_AnalogInput1 == 2);
assert(ADC_CONFIG_PSEL_AnalogInput2 == 4);
// make reading
return nrf_adc_convert_single(1 << (pinInfo[pin].analog & JSH_MASK_ANALOG_CH)) / 1024.0;
}
static void show_startup_screen(void)
{
char vbat_buff[BUFF_SZ+1] = {0};
nrf_adc_config_t adc_config = {
.resolution = NRF_ADC_CONFIG_RES_10BIT,
.scaling = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE,
.reference = NRF_ADC_CONFIG_REF_VBG
};
nrf_adc_configure(&adc_config);
unsigned v = nrf_adc_convert_single(VBAT_SENSE_PIN);
float vbat = vbat_adc_to_mv(v);
glcd_print_str(0, 0, "waiting data ...", &g_font_Tahoma15x16, 1);
snprintf(vbat_buff, BUFF_SZ, "Vbat=%.3f", vbat);
glcd_print_str(0, 3, vbat_buff, &g_font_Tahoma15x16, 1);
if (vbat < 3.2) {
glcd_print_str(0, 6, "Low charge!", &g_font_Tahoma15x16, 1);
nrf_delay_ms(1000);
}
nrf_delay_ms(1000);
}
/// Returns a quickly-read analog value in the range 0-65535
int jshPinAnalogFast(Pin pin) {
if (pinInfo[pin].analog == JSH_ANALOG_NONE) return 0;
#ifdef NRF52
// sanity checks for channel
assert(NRF_SAADC_INPUT_AIN0 == 1);
assert(NRF_SAADC_INPUT_AIN1 == 2);
assert(NRF_SAADC_INPUT_AIN2 == 3);
nrf_saadc_input_t ain = 1 + (pinInfo[pin].analog & JSH_MASK_ANALOG_CH);
nrf_saadc_channel_config_t config;
config.acq_time = NRF_SAADC_ACQTIME_3US;
config.gain = NRF_SAADC_GAIN1_4; // 1/4 of input volts
config.mode = NRF_SAADC_MODE_SINGLE_ENDED;
config.pin_p = ain;
config.pin_n = ain;
config.reference = NRF_SAADC_REFERENCE_VDD4; // VDD/4 as reference.
config.resistor_p = NRF_SAADC_RESISTOR_DISABLED;
config.resistor_n = NRF_SAADC_RESISTOR_DISABLED;
// make reading
nrf_saadc_enable();
nrf_saadc_resolution_set(NRF_SAADC_RESOLUTION_8BIT);
nrf_saadc_channel_init(0, &config);
return nrf_analog_read() << 8;
#else
const nrf_adc_config_t nrf_adc_config = {
NRF_ADC_CONFIG_RES_8BIT, // 8 bit for speed (hopefully!)
NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE,
NRF_ADC_CONFIG_REF_VBG }; // internal reference
nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config);
// sanity checks for nrf_adc_convert_single...
assert(ADC_CONFIG_PSEL_AnalogInput0 == 1);
assert(ADC_CONFIG_PSEL_AnalogInput1 == 2);
assert(ADC_CONFIG_PSEL_AnalogInput2 == 4);
// make reading
return nrf_adc_convert_single(1 << (pinInfo[pin].analog & JSH_MASK_ANALOG_CH)) << 8;
#endif
}
uint32_t battery_get_level(void) {
return nrf_adc_convert_single(NRF_ADC_CONFIG_INPUT_6);
}
